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Theme app extensions now support conditional app blocks
API
Effective April 04, 2022
The visibility of an app block, or app embed block, of a theme app extension can now be controlled based on a custom condition.
The condition can be included in the block's schema with the available_if attribute, and the state of the condition is stored in an app-owned metafield. The metafield can be accessed through the Liquid app object.
To learn more about conditional app blocks, refer to Theme app extensions framework.